Improve AgentKit get_tools pagination defaults

[saif-at-scalekit]

Problem

AgentKit framework helpers such as actions.langchain.get_tools() and actions.google.get_tools() accept page_size=None by default. The service default is 10 tools, so connectors with more than 10 tools can appear incomplete.

The helpers return framework-ready tool lists and do not expose pagination metadata such as next_page_token or total_size, so developers do not get a signal that the result set was truncated. This caused confusion for connectors such as Slack, where a newly enabled tool may be beyond the first default page.

Verified current behavior

• scalekit/actions/frameworks/langchain.py defines get_tools(..., page_size: Optional[int] = None, page_token: Optional[str] = None) and passes those values to self.tools.list_scoped_tools(...).
• scalekit/actions/frameworks/google_adk.py has the same default and behavior.
• Lower-level actions.tools.list_scoped_tools(...) returns the response tuple with pagination metadata and can be called with page_size=100.

Suggested fix

• Make framework get_tools() helpers default to page_size=100, or otherwise emit a clear warning/metadata path when the first page may be truncated.
• Update docstrings to recommend page_size=100 for tool discovery.
• Keep actions.tools.list_scoped_tools(identifier=..., page_size=100, filter=ScopedToolFilter(...)) documented as the lower-level discovery API when callers need pagination metadata.

Developer impact

A developer should not need to know about the default page size to discover all tools for a connector.